So confused. Please help

First of all... Excuse the duct tape lollol I ran out of clear tape. But anyway... Is this normal? This is my first month tracking. I had a miscarriage and Dc&e on April 14th, got my first period 3 days later. I thought it was just me expelling left overs, but it was indeed my period. Rare but possible and a fact, this coming from my doctor so please don't try to tell me it's not possible to get your period that quickly. I started testing on CD 14 because that is when my tests came in the mail. Everything was right on track with glow and my tests. Got my surge on CD 16. I'm continuing to test until I get complete negatives but as you can see, I have yet to get a negative. How long will it take until I get a negative? Am I only getting positives because of being more fertile after the pregnancy? Any and all advice is appreciated and needed.